Karen Breen

Consultant haematologist with a specialist interest in thrombosis


Karen Breen is a consultant haematologist at Guy's and St Thomas' NHS Foundation Trust. She is based in the haemostasis and thrombosis centre and in the department of haematology.

She has a specialist interest in thrombosis.

Education and training

  • Doctor of Medicine (MD) in antiphospholipid syndrome
  • Trinity College, Dublin medical training scheme
  • Royal College of Physicians (Ireland) higher medical training scheme in haematology

Research interests

  • Antiphospholipid syndrome
  • Thrombosis

Karen is involved in several clinical trials and in translational research in antiphospholipid syndrome.


  • Prize for best speaker, MacDonald Obstetric Society meeting, May 2011
  • Haematology Association of Ireland scholarship

Last updated: March 2023

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